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再生混凝土被视为节约材料的一种重要举措,同时,废轮胎橡胶粉的适量掺入可以优化混凝土的性能。为使两种废弃材料合理利用,本文以废轮胎橡胶粉和废弃混凝土加工生成的再生骨料为研究对象,研究了外掺废轮胎橡胶粉对再生混凝土力学特性的影响。通过对再生混凝土基准组的试验研究,得到了再生混凝土前28 d的强度发育规律,结合此规律并在其他学者研究的基础上拟合出再生混凝土早期抗压强度数学模型;同时,对再生混凝土外掺不同粒径(20目、60目、80目、100目、120目)和不同掺量(3%、6%、9%)的橡胶粉,并研究除灾此情况下橡胶粉对不同龄期再生混凝土的抗压强度的影响。试验结果表明:掺入橡胶粉会降低再生混凝土的抗压强度;当掺入粒径为20目,掺量为3%的橡胶粉时,再生混凝土抗压强度最好。
Recycled concrete is considered as an important tool to save material, meanwhile, the proper blending of waste tire rubber powder can optimize the performance of concrete. In order to make rational use of the two kinds of waste materials, this paper takes the recycled aggregate produced from the waste tire rubber powder and the waste concrete processing as the research object, and studies the influence of the rubber powder with waste tire on the mechanical properties of the recycled concrete. Based on the experimental study of the recycled concrete base set, the strength development rules of the recycled concrete for the first 28 days were obtained. Based on the study of other disciplines, the mathematical model of early compressive strength of recycled concrete was established. At the same time, Except for rubber powder with different particle size (20 mesh, 60 mesh, 80 mesh, 100 mesh, 120 mesh) and different content (3%, 6%, 9% Influence of compressive strength of recycled concrete of the same age. The test results show that the incorporation of rubber powder will reduce the compressive strength of recycled concrete. The compressive strength of recycled concrete is the best when the rubber powder with 20 mesh size and 3%